Adjustable dumbbell



FIG. 1 is a top perspective view of an adjustable dumbbell showing my new design;

FIG. 2 is a bottom perspective view of FIG. 1 ;

FIG. 3 is a front view of FIG. 1 ;

FIG. 4 is a left view of FIG. 1 ;

FIG. 5 is a top view of FIG. 1 ;

FIG. 6 is a bottom view of FIG. 1 ;

FIG. 7 is an enlarged view of a portion of FIG. 1 ;

FIG. 8 is an enlarged view of a portion of FIG. 3 ;

FIG. 9 is an enlarged view of a portion of FIG. 5 ; and,

FIG. 10 is an enlarged view of a portion of FIG. 5 .

The broken lines in the figures depict portions of the adjustable dumbbell that form no part of the claimed design. 

CLAIM The ornamental design for an adjustable dumbbell, as shown and described. 